If you've got a feed supply store, they'll have some chick starter to feed your baby chicks for the next 8 weeks.
If you're chicks have not been vaccinated, you can give them the medicated chick starter if you like.
Your heating requirements will vary depending on the size of your brooder; just keep an eye on the thermometer.
No other supplements are necessary.

thanks. I've found plenty of info already but just getting confused with it all. I'm only getting 6 chicks without vaccinations so I guess I don't need the medicated feed since my flock will be small... what does the medicated feed treat? what about grit? oyster shells?

Medicated feed is to help build up immunity against coccidiosis (an internal parasite) which can be present in your soil whether you have chickens or not.

Grit is used to grind up food (other than commercial feed) in the chicken's gizzard. If you feed treats before they go outside where they can pick up small bits of stone to use in their girds, you need to supply some.. All purpose sand will serve as grit quite well. Play sand will not.

Crushed oyster shell is for layers. Chicks should not get layer feed with the extra calcium in it - not until they start laying eggs!